Regexp::Common::support -- Support functions for Regexp::Common.

       Abigail (regexp-common@abigail.freedom.nl).

       Bound to be plenty.

       This module contains some subroutines to be used by other "Regexp::Common" modules. It's not intended to
       be used directly. Subroutines from the module may disappear without any notice, or their meaning or
       interface may change without notice.

       luhn
           This subroutine returns true if its argument passes the luhn checksum test.

       This software is Copyright (c) 2001 - 2024, Damian Conway and Abigail.

       This module is free software, and maybe used under any of the following licenses:

        1) The Perl Artistic License.     See the file COPYRIGHT.AL.
        2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
        3) The BSD License.               See the file COPYRIGHT.BSD.
        4) The MIT License.               See the file COPYRIGHT.MIT.

perl v5.38.2                                       2024-08-10                      Regexp::Common::_support(3pm)

       Regexp::Common::support -- Support functions for Regexp::Common.

       <http://www.webopedia.com/TERM/L/Luhn_formula.html>.

           use Regexp::Common::_support qw /luhn/;

           luhn ($number)    # Returns true/false.